Communications: electrical – Digital comparator systems
Patent
1978-04-17
1980-07-29
Yusko, Donald J.
Communications: electrical
Digital comparator systems
73362AR, 328144, G01K 722, G01N 724, G06G 720
Patent
active
042153360
ABSTRACT:
A thermistor temperature sensor having non-linear electrical response characteristics with temperature, a material constant, beta, that varies with temperature, and providing an output signal indicative of the temperature desired to be measured is utilized herein. A time dependent signal having a configuration that offsets the non-linear temperature dependence of the sensor output signal is generated and compared to the sensor output signal. Whenever the sensor output at least equals that of the offsetting signal, a comparator generates an output signal that, after appropriate delay, is indicative of the actual temperature. The material "constant" of the sensor is maintained substantially constant over at least a substantial range of temperatures. Additionally or alternatively, the sensor is energized in such manner as to substantially eliminate self-heating induced variations in the sensor output signal.
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McNeil-Akron, Inc.
Yusko Donald J.
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